/ dʌf; NAmE / adjective , noun , verb
■ adjective
( BrE , informal ) useless; that does not work as it should :
He sold me a duff radio.
■ noun
( NAmE , informal ) a person's bottom
■ verb
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PHRASAL VERBS
- duff sb up
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WORD ORIGIN
adjective late 18th cent. (denoting something worthless): of unknown origin.
noun mid 19th cent.: of unknown origin.